Regeneration in transplanted halves of male genital disks and its influence upon duration of development inEphestia kühniella Z.

Herold's organs from full-grown (T7) larvae ofEphestia kühniella were longitudinally bisected and both halves transplanted into a single T7-host. Three classes of results were observed after metamorphosis of the hosts: I. each of the two halves regenerated a complete genital organ, II. only one of the two halves regenerated, III. none of the two halves regenerated the missing parts (cf. Kroeger, 1959, Dewes, 1972).The onset of pupation of the hosts was delayed when one half (average delay 1.7 days) or both halves (average delay 2.5 days) underwent regeneration. No delay was observed in controls or when no regeneration took place (Table 1).